African monitors said Tuesday that Guinea's weekend election was conducted properly, but the political opposition to incumbent Alpha Conde, which has already claimed victory, dismissed it as fraudulent.
Setting the stage for an election dispute, the opposition campaign director told reporters the government is carrying out "large-scale fraud" in counting ballots from the hotly contested October 18 poll.
Guinea's leading opposition politician Cellou Dalein Diallo already declared victory Monday against Conde -- before the announcement of the official results, which is expected this week.
"Alpha Conde is doing everything possible to change ballot-box results in his favour," said Fode Oussou Fofana, Diallo's campaign director, in the capital Conakry.
Conde, 82, is seeking a controversial third presidential term, a move that has triggered months of deadly unrest in the West African nation.
But earlier on Tuesday, monitors from regional African blocs cast the vote as mostly fair.
Augustin Matata Ponyo, the African Union's head of mission in Guinea, said the ballot took place "in transparency", for example. The head of the West African ECOWAS monitoring mission also said the vote was lawful.
Celebrations in Conakry of Diallo's self-proclaimed victory quickly descended into violent clashes with security forces, in which several youngsters were shot dead, opposition officials said.
AFP was unable to independently confirm the deaths, but an AFP journalist saw three injured people and heard gunfire in a Conakry suburb on Monday night.
Meanwhile in a seeming response to Diallo's self-proclaimed win, security forces dressed in riot gear surrounded his house in the capital. He tweeted that he was trapped inside.
'Irresponsible and dangerous'
Security forces killed dozens of people in protests against a Conde third term, which began in October last year.
Although polling day was mostly calm, Diallo's self-proclaimed election victory has ratched up tensions in the former French colony of some 13 million people.
The government insists the vote was fair and that only the official electoral authority can declare the results.
Conde's RPG party also called Diallo's move "irresponsible and dangerous" on Monday.
The international community is concerned too. The United Nations, African Union, and the 15-nation ECOWAS called the premature declaration of results "regrettable", in a joint statement on Monday.
"This state of affairs is not conducive to preserving calm," the statement said.
But on Tuesday, the communications director for Diallo's UFDG party, Ousmane Gaoual Diallo, said the party's own analysis of polling data collected from individual stations showed the opposition leader had won over 50 percent of the votes.
The official polling-station reports sent to the electoral authority are "completely different" to the actual results, he told AFP.
Twelve candidates are vying for the presidency, but Conde and Diallo are the frontrunners.
Guinea's government said in a statement Monday that the opposition "clearly intended to create chaos and to call into question the real results".
Much of the deep opposition to Conde stems from his bid for a third term.
He pushed through a new constitution in March which he argued would modernise the country. But it also allowed him to bypass a two-term limit for presidents.
After decades as an opposition activist, Conde became Guinea's first democratically elected president in 2010 and he won again in 2015.
Rights groups now accuse him of veering towards authoritarianism, however.
Diallo was formerly a prime minister under authoritarian leader Lansana Conte.
He unsuccessfully challenged Conde in both 2010 and 2015, in elections his party activists are convinced were rigged.
An acrimonious political campaign in the run-up to the vote saw Conde and Diallo trade insults, as well as violent incidents break out in some parts of the country.
The campaign also raised the spectre of ethnic strife, with Conde accused of exploiting divisions for electoral ends -- a charge he denies.
Guinea's politics are mainly drawn along ethnic lines: the president's base is mostly from the ethnic Malinke community and Diallo's from the Fulani people.
A second round of voting, if needed, is scheduled for November 24.